Document create_filter().

[ffmpeg] / libavfilter / formats.c

diff --git a/libavfilter/formats.c b/libavfilter/formats.c
index bd8ce6258fae0f4f25b86eefd0907a648dab26cb..2a9bdb0bd0600b7001651ad8b49be709a5cfe3c7 100644 (file)
--- a/libavfilter/formats.c
+++ b/libavfilter/formats.c
@@ -19,8 +19,26 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "libavutil/pixdesc.h"
 #include "avfilter.h"
 
+/**
+ * Add all refs from a to ret and destroy a.
+ */
+static void merge_ref(AVFilterFormats *ret, AVFilterFormats *a)
+{
+    int i;
+
+    for(i = 0; i < a->refcount; i ++) {
+        ret->refs[ret->refcount] = a->refs[i];
+        *ret->refs[ret->refcount++] = ret;
+    }
+
+    av_free(a->refs);
+    av_free(a->formats);
+    av_free(a);
+}
+
 AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b)
 {
     AVFilterFormats *ret;
@@ -36,72 +54,65 @@ AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b)
             if(a->formats[i] == b->formats[j])
                 ret->formats[k++] = a->formats[i];
 
+    ret->format_count = k;
     /* check that there was at least one common format */
-    if(!(ret->format_count = k)) {
+    if(!ret->format_count) {
         av_free(ret->formats);
         av_free(ret);
         return NULL;
     }
 
-    /* merge and update all the references */
     ret->refs = av_malloc(sizeof(AVFilterFormats**)*(a->refcount+b->refcount));
-    for(i = 0; i < a->refcount; i ++) {
-        ret->refs[ret->refcount] = a->refs[i];
-        *ret->refs[ret->refcount++] = ret;
-    }
-    for(i = 0; i < b->refcount; i ++) {
-        ret->refs[ret->refcount] = b->refs[i];
-        *ret->refs[ret->refcount++] = ret;
-    }
 
-    av_free(a->refs);
-    av_free(a->formats);
-    av_free(a);
-
-    av_free(b->refs);
-    av_free(b->formats);
-    av_free(b);
+    merge_ref(ret, a);
+    merge_ref(ret, b);
 
     return ret;
 }
 
-AVFilterFormats *avfilter_make_format_list(int len, ...)
+AVFilterFormats *avfilter_make_format_list(const enum PixelFormat *pix_fmts)
 {
-    AVFilterFormats *ret;
-    int i;
-    va_list vl;
+    AVFilterFormats *formats;
+    int count;
 
-    ret = av_mallocz(sizeof(AVFilterFormats));
-    ret->formats = av_malloc(sizeof(*ret->formats) * len);
-    ret->format_count = len;
+    for (count = 0; pix_fmts[count] != PIX_FMT_NONE; count++)
+        ;
 
-    va_start(vl, len);
-    for(i = 0; i < len; i ++)
-        ret->formats[i] = va_arg(vl, int);
-    va_end(vl);
+    formats               = av_mallocz(sizeof(AVFilterFormats));
+    formats->formats      = av_malloc(sizeof(*formats->formats) * count);
+    formats->format_count = count;
+    memcpy(formats->formats, pix_fmts, sizeof(*formats->formats) * count);
 
-    return ret;
+    return formats;
+}
+
+int avfilter_add_colorspace(AVFilterFormats **avff, enum PixelFormat pix_fmt)
+{
+    enum PixelFormat *pix_fmts;
+
+    if (!(*avff) && !(*avff = av_mallocz(sizeof(AVFilterFormats))))
+        return AVERROR(ENOMEM);
+
+    pix_fmts = av_realloc((*avff)->formats,
+                          sizeof((*avff)->formats) * ((*avff)->format_count+1));
+    if (!pix_fmts)
+        return AVERROR(ENOMEM);
+
+    (*avff)->formats = pix_fmts;
+    (*avff)->formats[(*avff)->format_count++] = pix_fmt;
+    return 0;
 }
 
 AVFilterFormats *avfilter_all_colorspaces(void)
 {
-    return avfilter_make_format_list(35,
-                PIX_FMT_YUV444P,  PIX_FMT_YUV422P,  PIX_FMT_YUV420P,
-                PIX_FMT_YUV411P,  PIX_FMT_YUV410P,
-                PIX_FMT_YUYV422,  PIX_FMT_UYVY422,  PIX_FMT_UYYVYY411,
-                PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P,
-                PIX_FMT_YUV440P,  PIX_FMT_YUVJ440P,
-                PIX_FMT_RGB32,    PIX_FMT_BGR32,
-                PIX_FMT_RGB32_1,  PIX_FMT_BGR32_1,
-                PIX_FMT_RGB24,    PIX_FMT_BGR24,
-                PIX_FMT_RGB565,   PIX_FMT_BGR565,
-                PIX_FMT_RGB555,   PIX_FMT_BGR555,
-                PIX_FMT_RGB8,     PIX_FMT_BGR8,
-                PIX_FMT_RGB4_BYTE,PIX_FMT_BGR4_BYTE,
-                PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE,
-                PIX_FMT_GRAY8,    PIX_FMT_PAL8,
-                PIX_FMT_MONOWHITE,PIX_FMT_MONOBLACK,
-                PIX_FMT_NV12,     PIX_FMT_NV21);
+    AVFilterFormats *ret = NULL;
+    enum PixelFormat pix_fmt;
+
+    for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++)
+        if (!(av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_HWACCEL))
+            avfilter_add_colorspace(&ret, pix_fmt);
+
+    return ret;
 }
 
 void avfilter_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
@@ -124,7 +135,12 @@ void avfilter_formats_unref(AVFilterFormats **ref)
 {
     int idx;
 
-    if((idx = find_ref_index(ref)) >= 0)
+    if (!*ref)
+        return;
+
+    idx = find_ref_index(ref);
+
+    if(idx >= 0)
         memmove((*ref)->refs + idx, (*ref)->refs + idx+1,
             sizeof(AVFilterFormats**) * ((*ref)->refcount-idx-1));
 
@@ -139,9 +155,9 @@ void avfilter_formats_unref(AVFilterFormats **ref)
 void avfilter_formats_changeref(AVFilterFormats **oldref,
                                 AVFilterFormats **newref)
 {
-    int idx;
+    int idx = find_ref_index(oldref);
 
-    if((idx = find_ref_index(oldref)) >= 0) {
+    if(idx >= 0) {
         (*oldref)->refs[idx] = newref;
         *newref = *oldref;
         *oldref = NULL;